Year	Number
1970	244000
1971	331100
1972	379000
1973	375700
1974	475000
1975	652500
1976	744700
1977	862300
1978	1015600
1979	1225500
1980	1342000
1981	1220300
1982	1160100
1983	1299000
1984	1359500
1985	1343300
1986	1300700
1987	1232600
1988	1266700
1989	1272600
1990	1237600
1991	1200000
1992	1214400
1993	1117000
1994	1175200
1995	1223700
1996	1783500
1997	2250800
1998	2115500
1999	1872600
2000	1756608
2001	1557128
2002	1508700
2003	1770774
2004	1824313
2005	1892343
2006	1443165
2007	1744663
2008	1718196
2009	1537032
2010	1781340
2011	2125912.52659794
2012	2206069.76066974
2013	2027888
2014	3563043.5828127
2015	4115271
2016	3678739
2017	4053427.35
2018	4122113
2019	4066959
2020	2627202.201
2021	4311879.56